HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>pagehide modern demo</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 520px; }

    button { padding: 10px 16px; cursor: pointer; background: #ea580c; color: #fff; border: none; border-radius: 6px; margin-right: 8px; }

    #log { margin-top: 12px; padding: 12px; background: #fff7ed; border-radius: 6px; font-size: 14px; min-height: 80px; }

    .badge { display: inline-block; background: #bbf7d0; padding: 4px 8px; border-radius: 4px; font-size: 12px; margin-bottom: 8px; }

  </style>

</head>

<body>

  <div class="badge">jQuery 3.7 — pagehide recommended</div>

  <button type="button" id="listen">Bind pagehide</button>

  <button type="button" id="demo">Trigger pagehide demo</button>

  <div id="log">Bind pagehide, then trigger demo or navigate away.</div>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("#listen").on("click", function() {

      $(window).off("pagehide.demo").on("pagehide.demo", function(event) {

        var persisted = event.originalEvent && event.originalEvent.persisted;

        var msg = persisted ? "pagehide — page cached (bfcache)" : "pagehide — page leaving";

        $("#log").append("<p>" + msg + "</p>");

      });

      $("#log").html("<p>pagehide handler bound.</p>");

    });

    $("#demo").on("click", function() {

      $(window).trigger("pagehide");

      $("#log").append("<p>(Demo: jQuery trigger pagehide)</p>");

    });

  </script>

</body>

</html>

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jQuery pagehide — modern alternative (Try It)